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1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> lowAnalytical FAX(650)232-9612 <br /> www sequoialabs cam r <br /> Gettler-RyanlGeostratepies(1) Project Tosco(1) <br /> 6747 Sierra Court, Suite J Project Number Tosco(Unocal)SS96981 Stockton CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 09/27/01 10 19 <br /> Volatile Orga_me 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> Am-1 (L109080-02)Water Sampled 09/13/01 16 05 Received 09113101 19 30 <br /> Ethanol ND 1000 ug/l 1 1090069 09/19/01 09/19/01 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 " <br /> 1,2-Dichloroethane ND 2 0 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tent-butyl ether ND 2 0 " <br /> Methyl lert-butyl ether ND 2 0 " <br /> Ter(-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethane-d4 104% 76-114 " <br /> Surrogate Toluene-d8 992% 88-110 " <br /> MW-2 (L109080-03)Water Sampled 09/13/01 17 00 Received 09/13/01 19 30 <br /> Ethanol ND 1000 ugA 1 1090069 09/19/01 09/19/0) EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 <br /> 1,2-Dichloroethane ND 2 0 " <br /> Di-isopropyl ether ND 2 0 <br /> Ethyl ter(-buty) ether ND 20 <br /> Methyl Cert-butyl ether 62 20 " <br /> Teri-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethane-d4 102% 76-114 " <br /> Surrogate Toluene-d8 988% 88-110 " <br /> MW-4(L709080-04)Water Sampled 09/12/0115-07 Received 09/13/01 19 30 <br /> Ethanol ND 1000 ug/l 1 1090069 09/19/01 09/19/01 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 <br /> 1,2-Dichloroethane ND 2 0 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tert-butyl ether ND 2 0 <br /> Methyl tent-butyl ether ND 2 0 <br /> Ter(-amyl methyl ether ND 2 0 <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethane-d4 107% 76-114 " <br /> Surrogate Toluene-d8 976% 88-110 " <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 8 of 21 <br />